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This CL is changing the FontFallback signature to take an
StringPiece instead of a raw pointer and a length.

The CL doesn't include behavior changes.

R=asvitkine@chromium.org
Bug: 944227

Change-Id: I1302e5dd94ce9cf111ac8fb70b55f32d11aafbe3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594344
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658582}